OCA2 and albinism: OCA2 (OMIM #203200) caused by mutations in the OCA gene, formerly known as the “P” gene, is the most common form of albinism worldwide; the estimated prevalence is 1 in 10,000 in the African American population, 1 in 30,000 in Caucasians, and closer to 1 in 3,900 in southern parts of Africa [9,10,11,12].